import re
text = 'if you use words too often words become used'
#文本只由空格、标点与小写字母构成。要在文本中找出重复地很近(两个相同单词之间最多允许有10个单词)的单词，应如何操作？
def action():
    return None

def test_action():
    m = action()
    assert m.group('x') == 'words'
